Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
KRUEGER Single-Duct and Retro Fit Terminal Units
PRE-INSTALLATION General — The LMHS, RVE, and SVE single duct terminals are
available with factory installed Pneumatic, Analog electronic, and DDC control options. Figure 1
shows a basic LMHS unit.
Figure 1 – LMHS Unit (with pneumatic controls shown)
STORAGE AND HANDLING — Inspect for damage upon receipt. Shipping damage claims should
be filed with shipper at time of delivery. Store in a clean, dry, and covered location. Do not stack
cartons. When unpacking units, care should be taken that the inlet collars and externally mounted
components do not become damaged. Do not lift units using collars, inlet flow sensors, or
externally mounted components as handles. Do not lay uncrated units on end or sides. Do not
stack uncrated units over 6 ft high. Do not handle control boxes by tubing connections or other
external attachments. Table 1 shows component weights.
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
INITIAL INSPECTION — Once items have been removed from the carton, check carefully for
damage to duct connections, inlet probes or controls. File damage claim immediately with
transportation agency and notify Factory.
UNIT IDENTIFICATION — Each unit is supplied with a shipping label and an identification label:
INSTALLATION PRECAUTION — Check that construction debris does not enter unit or ductwork.
Do not operate the central-station air-handling fan without final or construction filters in place.
Accumulated dust and construction debris distributed through the ductwork can adversely affect
unit operation.
SERVICE ACCESS — Provide service clearance for unit access.
CODES — Install units in compliance with all applicable code requirements.
UNIT SUSPENSION — See Fig. 3 for optional unit suspension details:
Warranty – All Krueger furnished items carry the standard 1-year limited warranty from the date
of shipment.
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
MAINTENANCE
No periodic preventative maintenance required, unless called for by specific control sequence.
CONTROL ARRANGEMENTS
The LMHS single duct and RVE/SVE retrofit units are offered with a wide variety of factorymounted controls that regulate the volume of air delivery from the unit and respond to cooling and
heating load requirements of the conditioned space. Stand-alone controls will fulfill the thermal
requirements of a given control space. These devices are available in both pneumatic and
electronic arrangements. A number of DDC (Direct Digital Controls) control packages by others
are available for consignment mounting, as indicated.
Each control approach offers a variety of operating functions; a control package number identifies
combinations of control functions. The following listings contain the basic function arrangements
for each control offering. Because of the variety of functions available, circuit diagrams, operating
sequences, and function descriptions are contained in separate Application Data publications.
Refer to the specific control publication for details.
Direct Digital Electronic Control Arrangement (Field Supplied) — Control packages are
field supplied for factory mounting, unless otherwise noted. All DDC control arrangements include
a flow sensor, control enclosure and optional 24-volt transformer. Contact factory for details about
mounting field-supplied controls.
Analog Electronic Control Arrangement — Pressure independent control packages are
available without supplemental heat, with on/off hot water or electric heat, proportional hot water
heat, or with cooling/heating automatic changeover control. All analog control arrangements
include an inlet flow sensor, 24V transformer (optional), control enclosure and wall thermostat with
LCD display.
2100: Heating control
2101: Cooling control
2102: Cooling with on/off electric heat control
2103: Cooling with on/off hot water heat control
2104: Cooling/heating automatic changeover control
2105: Cooling with proportional hot water heat control
2110: Cooling with Solid State LineaHeat Proportional heat control
2111: Cooling/Heating with automatic change over with up to 3 stages of electric heat control
2113: Cooling/Heating with automatic change over with Solid State LineaHeat Proportional heat
2115: Upstream static pressure monitoring
2116: Downstream static pressure monitoring
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
Pneumatic Control Arrangement — All control packages are pressure independent (unless
otherwise noted) and available with or without hot water heat, dual maximum airflow, heating and
cooling maximum airflow and dual minimum airflow. All control arrangements include a standard
linear inlet flow sensor.
1100 (Actuator only): DA-NC Pressure dependent control
1101 (Actuator only): RA-NO Pressure dependent control
1102 (Single function controller): DA-NO with or without hot water or electric heat
1103 (Single function controller): RA-NC with or without hot water or electric heat
1104 (Multi-function controller): DA-NO with or without hot water or electric heat
1105 (Multi-function controller): DA-NC with or without hot water or electric heat
1106 (Multi-function controller): RA-NO with or without hot water or electric heat
1107 (Multi-function controller): RA-NC with or without hot water or electric heat
1108 (Dual Maximum Control): DA-NO with or without hot water or electric heat
1109 (Heating/Cooling Maximum Control): DA-NO with or without hot water or electric heat
1110 (Dual Minimum Control): DA-NO with or without hot water or electric heat
PNEUMATIC CONTROL LEGEND
DA: Direct acting thermostat
RA: Reverse acting thermostat
NO: Normally open damper position
NC: Normally closed damper position
Single function controller: Provides single function, i.e., DA-NO Multi-function controller: Capable
of providing DA-NO, DA-NC, RA-NC or RA-NO functions
No Control
0000: Unit with no control box. D000: Unit with control enclosure and transformer. D001: Unit with
control enclosure and no transformer. Also used for control enclosure and electric heat.
INSTALLATION
Step 1 — Install Unit
1. Move unit to installation area. Remove unit from shipping package. Do not handle by
controls, flow sensors or damper extension rod.
2. Optionally, the unit may have factory-installed hanger brackets.
3. Suspend units from building structure with straps, rods, or hanger wires. Secure the unit
and level it in each direction
Step 2 — Make Duct Connections
1. Install supply ductwork on each of the unit inlet collars. It is recommended that 3 duct
diameters of straight duct are supplied to the inlet of the unit. An elbow put at the inlet of
the unit will create turbulence at the inlet making it difficult for the flow sensor to accurately
measure the airflow. Check that air-supply duct connections are airtight and follow all
accepted medium-pressure duct installation procedures. (Refer to Table 2a – LMHS, 2b –
RVE, 2c – SVE for pressure and flow data).
2. Install the discharge ducts. Fully open all balancing dampers. For optimal performance it is
recommended that 3 inlet diameters of straight duct be provided to the unit. Ninety degree
elbows or tight radius flexible duct immediately upstream of inlet collar should be avoided
as these can affect the balancing of the unit.
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
Model: LMHS
Basic Pressure and Flow Data
Minimum Airflow
(CFM)
Inlet
Size
(area
ft2)
Maximum
Airflow
(CFM)
Cooling
Only
or with
Hot Water
Electric
Heat
4
(0.09)
230
40
55
5
(0.14)
360
62
85
6
(0.20)
515
90
110
7
(0.27)
700
121
140
8
(0.35)
920
160
190
9
(0.44)
1160
201
240
10
(0.55)
1430
248
300
12
(0.78)
2060
357
425
14
(1.07)
2800
486
580
16
(1.40)
3660
634
750
22
(2.63)
7000
1212
1800
Electric Heat*
Max Kw
vs. CFM
@55F EAT
55
110
150
230
85
140
250
360
100
250
400
520
140
330
550
700
190
440
700
920
240
550
900
1160
250
700
1100
1450
425
1000
1600
2060
580
1375
2100
2800
750
1775
2800
3660
1800
3300
5300
7000
1.1
2.2
3!
3!
1.7
2.8
5!
5!
2
5.1
7.5!
7.5!
2.9
6.7
9.5!
9.5!
3.9
9.1
13 !
13 !
4.9
11.3
16 !
16 !
5.1
14.3
21 !
21 !
8.7
20.6
30!
30!
11.9
28.2
36 !
36 !
15.4
36 !
36 !
36 !
36 !
36 !
36 !
36 !
Minimum Inlet Static Pressure
(Unit & Heat Pressure Drop)
Velocity
Press.
Basic
Unit
Basic
w/ 1R Coil
Basic
w/ 2R Coil
Basic
w/ 3R Coil
Basic
w/ 4R Coil
Basic +
Heater**
 VPS
 PS
 PS
 PS
 PS
 PS
 PS
0.02
0.10
0.18
0.43
0.02
0.06
0.21
0.43
0.02
0.10
0.25
0.42
0.02
0.09
0.25
0.40
0.02
0.09
0.23
0.39
0.02
0.08
0.23
0.38
0.01
0.08
0.21
0.36
0.01
0.08
0.20
0.33
0.01
0.07
0.16
0.29
0.01
0.06
0.14
0.24
0.02
0.07
0.17
0.30
0.01
0.05
0.10
0.24
0.01
0.03
0.10
0.21
0.01
0.04
0.10
0.17
0.01
0.04
0.10
0.16
0.01
0.04
0.10
0.17
0.01
0.04
0.10
0.17
0.01
0.04
0.10
0.17
0.01
0.04
0.10
0.17
0.01
0.04
0.10
0.18
0.01
0.04
0.10
0.17
0.01
0.04
0.10
0.17
0.02
0.06
0.12
0.28
0.02
0.05
0.15
0.31
0.01
0.09
0.22
0.38
0.01
0.08
0.22
0.36
0.02
0.12
0.29
0.51
0.02
0.09
0.25
0.42
0.02
0.13
0.32
0.56
0.02
0.14
0.35
0.58
0.02
0.13
0.30
0.53
0.02
0.14
0.34
0.58
0.05
0.18
0.45
0.79
0.02
0.07
0.13
0.31
0.02
0.06
0.19
0.40
0.02
0.13
0.34
0.57
0.02
0.12
0.33
0.53
0.03
0.19
0.47
0.81
0.03
0.14
0.38
0.64
0.03
0.21
0.53
0.91
0.04
0.22
0.57
0.95
0.04
0.21
0.48
0.85
0.04
0.22
0.56
0.95
0.09
0.30
0.77
1.35
0.02
0.08
0.15
0.35
0.03
0.07
0.24
0.49
0.03
0.17
0.45
0.75
0.03
0.16
0.44
0.71
0.05
0.25
0.64
1.11
0.04
0.19
0.52
0.86
0.04
0.29
0.73
1.26
0.06
0.31
0.80
1.32
0.05
0.28
0.66
1.17
0.06
0.31
0.77
1.32
0.13
0.42
1.09
1.91
0.02
0.09
0.16
0.39
0.03
0.09
0.28
0.58
0.03
0.22
0.56
0.94
0.04
0.20
0.54
0.88
0.06
0.32
0.82
1.42
0.05
0.24
0.66
1.09
0.05
0.38
0.93
1.62
0.07
0.40
1.02
1.69
0.06
0.36
0.84
1.49
0.07
0.40
0.99
1.69
0.16
0.55
1.41
2.46
0.01
0.05
0.10
0.24
0.01
0.03
0.10
0.21
0.01
0.04
0.10
0.17
0.01
0.04
0.10
0.16
0.01
0.04
0.10
0.17
0.01
0.04
0.10
0.17
0.01
0.04
0.10
0.17
0.01
0.04
0.10
0.17
0.01
0.04
0.10
0.18
0.01
0.04
0.10
0.17
0.01
0.04
0.10
0.17
Notes:
1.) ∆ PS is the difference in static pressure across the assembly, with the damper fully open.
2.) To obtain Total Pressure, add the Velocity Pressure for a given CFM to the Static Pressure drop (D PS) of the
Example: Pt for a Size 8 Basic Unit @925 CFM = 0.39 + 0.17 = 0.56
3.) Max Kw shown assumes 55F entering air and is limited by unit's selected voltage, phase and max capacity. Minimum cfm for electric heat is based
on UL/ETL listings. Note: Diffuser performance will likely be poor at this low flow rate.
4.) Maximum discharge temperatures with Electric Heat are set at 120F by the National Electric Code.
* The ASHRAE Handbook of Fundamentals does not recommend a discharge temperature exceeding 90F
** A minimum 0.10” discharge static pressure is required to ensure steady operation for the airflow switch in the electric heater
*** Minimums for DDC by others are the responsibility of the controls' provider.
! Max Kw is limited by design
Table 2a - LMHS
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
Model: RVE
Inlet Size
(area ft2)
4
(0.09)
5
(0.14)
6
(0.20)
7
(0.27)
8
(0.35)
9
(0.44)
10
(0.55)
12
(0.78)
14
(1.07)
16
(1.40)
Notes:
1.)
2.)
Maximum
Airflow (CFM)
230
360
515
700
920
1160
1430
2060
2800
3660
Minimum Airflow
(CFM)
Flow Rate
Min Ps
CFM
"WG
40
62
90
121
160
201
248
357
486
634
40
0.007
103
0.048
167
0.126
230
0.239
62
0.008
161
0.052
261
0.137
360
0.261
90
0.007
233
0.050
377
0.131
520
0.249
120
0.007
330
0.056
525
0.142
700
0.252
160
0.008
440
0.059
675
0.138
920
0.256
200
0.008
550
0.058
875
0.146
1160
0.257
250
0.008
675
0.056
1075
0.142
1430
0.252
360
0.008
1000
0.060
1550
0.143
2060
0.253
480
0.008
1375
0.063
2125
0.149
2800
0.259
630
0.008
1775
0.060
2725
0.141
3660
0.255
∆ Ps is the difference in static pressure across the assembly, with the damper fully open.
Minimum CFM value is based on a signal of 0.03 in w.g. differential pressure of the inlet
Table 2b - RVE
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
Model: SVE
Inlet
Size
Maximum
Airflow (CFM)
Minimum
Airflow (CFM)
A
456
79
B
656
114
C
875
152
D
1458
253
E
2042
354
F
1969
351
G
2188
379
H
3281
568
J
3938
682
K
5104
884
L
6563
1137
M
6417
1111
N
7875
1364
P
10938
1894
R
14583
2526
Flow Rate
Min DPs
CFM
"WG
75
155
235
315
114
225
350
473
152
350
575
786
253
475
675
902
354
675
1000
1328
341
650
950
1270
379
725
1075
1435
568
1175
1775
2414
682
1475
2300
3121
884
2225
3550
4923
1137
2925
4725
6563
1111
2850
4625
6417
1364
3525
5650
7875
1894
4875
7875
10938
2526
6500
10475
14583
0.057
0.242
0.556
1.000
0.058
0.226
0.548
1.000
0.037
0.198
0.535
1.000
0.079
0.278
0.561
1.001
0.071
0.258
0.567
1.000
0.072
0.262
0.560
1.001
0.070
0.255
0.561
1.000
0.055
0.237
0.541
1.000
0.048
0.223
0.543
1.000
0.032
0.204
0.520
1.000
0.013
0.085
0.222
0.429
0.017
0.110
0.290
0.559
0.013
0.086
0.221
0.430
0.013
0.086
0.223
0.430
0.013
0.085
0.221
0.429
Notes:
1.)
Minimum CFM value is based on a signal of 0.03 in w.g. differential pressure of the inlet
Table 2c - SVE
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
Step 3 — Install Sensors and Make Field Wiring Connections — Electric Analog or
DDC (Direct Digital Controls) — Refer to specific unit dimensional submittals and control
application diagrams for control specifications. All field wiring must comply with National Electrical
Code (NEC) and local requirements. Refer to the wiring diagram on the unit for specific wiring
connections. A field-supplied transformer is required if the unit was not equipped with a factory
installed transformer. See Fig. 4.
L1
120VAC
208VAC
240VAC
277VAC
LEGEND
Factory Wiring
Field Wiring
CLASS II
TRANSFORMER
GROUND
24 VAC
ANALOG OR DDC
CONTROLLER
24 VAC
POWER
YELLOW
BLUE
Figure 4 - Wiring of Optional Factory Mounted Transformer
NOTE: Refer to wiring diagram attached to each unit for specific information on that particular unit.
Unit airflow should not be set outside of the range noted in Table. 2a.
Single duct terminal units with electric heat are supplied with a single point wiring connection in the
heater control box. All unit power is supplied through this connection. Models with electric heat are
factory equipped with a control transformer. See Fig. 5.
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
Terminal Block Or or
Optional Disconnect Switch
Line Fuse
(Optional)
Transformer
Brown #12
Black #18
Yellow #18
L1
L3
Yellow #12
N
24VAC
Brown #12
Red #12
Red #12
L2
480V
Yellow #18
Blue #18
Blue #18
Red #18
Black #18
COM
White #18
White #18
To
Controller
Brown #18
White #12
Black #18
Yellow #12
Power
Supply
Manual
Reset
N.O.
AFS
Yellow #12
Red #12
Step 3
Heat Contactor
Yellow #12
Step 2
Heat Contactor
Red #12
Black #18
Red #18
Step 1
Heat Contactor
Brown #12
Note: Drawing is typical of 480V
3-phase, 4 wire heater and
controller. Refer to actual unit
wiring diagram located on inside
cover of control enclosure.
White #12
LEGEND
AFS: Airflow Switch
DDC: Direct Digital Controls
Black #18
Black #18
Brown #12
Thermal Hi-Limit
Auto-Reset (Typ)
White #12
Figure 5 - Typical Power Connections for LMHS units with 3-Stage Electric Heat
Wiring and unit ampacities are referenced in Table 3.
NOTE: Refer to wiring diagram attached to each unit for specific information on that particular unit. Units
with 480-3-60 electric heater REQUIRE 4-wire, wye connected power. Units with 208/230 v, 3-phase heater
can be connected with 3-wire power. Unit airflow should not be set outside of the range noted in Figure 6.
The minimum recommended airflow for units with electric heat must be at least 75 cfm per kW and not drop
below the minimum values listed in Table 2a. The maximum unit discharge temperature should not exceed
120 F. To prevent air stratification, the ASHREA Handbook of Fundamentals recommends a discharge
temperature not to exceed 90F.
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
CONTROL SET UP General — The LMHS single duct VAV terminal is designed to supply a
varying quantity of cold primary air to a space in response to a thermostat demand. Some units
have reheat options to provide heating demand requirements as well. Most VAV terminals are
equipped with pressure compensating controls to regulate the response to the thermostat
independent of the pressure in the supply ductwork. To balance the unit it is necessary to set both
the maximum and minimum set points of the controller. The many types of control options
available each have specific procedures required for balancing the unit
Set Points — Maximum and minimum airflow set points are normally specified for the job and
specific for each unit on the job. Where maximum and minimum airflow levels are not specified on
the order, default values are noted on unit ID label.
Field Adjustment of Minimum and Maximum Airflow Set Points
Each unit is equipped with an amplifying flow probe that measures a differential pressure
proportional to the airflow. The relationship between flow probe pressures and cfm is shown in the
Flow Probe Graphs (Fig.6). This chart is attached to each unit. There are several conventions (and
no universally accepted method) in use for representing this flow factor:
1. Magnification Factor: The magnification factor may be expressed as the ratio of either
velocity or pressure, of the output of the sensor to that of a pitot tube.
a. For example, a velocity magnification may be used. All Krueger probes develop
an average signal of 1” w.g. @ 2625 fpm. This gives a velocity magnification of
4005 / 2625 or 1.52.
b. It may be a pressure magnification factor. In this case, the ratio of pressures at a
given air velocity is presented. For a velocity constant of 2626, at 1000 fpm, this is
0.1451 / 0.0623 = 2.33
2. K-Factor: The K-factor may be represented in two ways:
a. It may be a velocity K-factor, which is the velocity factor times the inlet area,
(which for all Krueger probes, both the Linear and the k4 LineaCross, is 2625
fpm/in w.g.).
b. Alternatively, it may be the airflow K-Factor, which is the velocity factor times the
inlet area. For an 8 inch Krueger unit, therefore, this would be 2625 * 0.349, or
916. A separate airflow factor is required for each size. All Krueger VAV terminals
have round inlets. Below is a K-Factor table for all Krueger VAV terminal inlets.
Inlet Probe Area and K Factor
LMHS, RVE
Inlet Diameter, in.
Velocity Magnification
Velocity Constant
CFM K Factor.
04
4
1.52
2625
229
05
5
1.52
2625
358
06
6
1.52
2625
515
Inlet Area, Sq. ft.
0.087
0.136
0.196
Recommended Min
cfm
40
62
89
07
7
1.52
2625
702
0.26
7
122
08
8
1.52
2625
916
09
9
1.52
2625
1160
10
10
1.52
2625
1432
0.349
0.442
0.545
159
201
248
12
12
1.52
2625
2062
0.78
5
357
14
14
1.52
2625
2806
16
16
1.52
2625
3665
1.069
1.396
486
635
Table 4
System Calibration of the Flow Probe — To achieve accurate pressure independent
operation, the velocity sensor and flow probe must be calibrated to the controller. This will ensure
that airflow measurements will be accurate for all terminals at system start-up. System calibration
is accomplished by calculating a flow coefficient that adjusts the pressure fpm characteristics. The
flow coefficient is determined by dividing the flow for a given unit (design air volume in cfm), at a
pressure of 1.0 in. w.g differential pressure, by the standard Pitot tube coefficient of 4005.
22
22
1.52
2625
7000
2.66
7
1212
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
This ratio is the same for all sizes, no matter which probe type is installed. Determine the design
air velocity by dividing the design air volume (the flow at 1.0 in. w.g) by the nominal inlet area (sq.
ft). This factor is the K factor.
Figure 6 – Inlet Sensor Pressure Chart
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
PNEUMATIC CONTROLS
Volume controllers for LMHS units are shown in Fig. 7, 8 and 9. Identification for each controller is
shown in Table 5.
Control Sequence Function Arrangement Identification
Figure
DA‐NO
7
1102
1103
RA‐NC
8
1104
DA‐NO
9
1105
DA‐NC
9
1106
RA‐NO
9
RA‐NC
9
1107
1108
DUAL MAXIMUM
9
1109
HEATING/COOLING MAXIMUM
9
1110
DUAL MINIMUM
9
Preparation for Balancing (Control Sequences 1102 and 1103)
KMC Part Number
CSC‐2003
CSC‐2004
CSC‐3011
CSC‐3011
CSC‐3011
CSC‐3011
CSC‐3011
CSC‐3011(2X)
CSC‐3011
1. Inspect all pneumatic connections to assure tight fit and proper location.
2. Verify that the thermostat being used is compatible with the control sequence provided
(direct acting or reverse acting).
3. Check main air pressure at the controller(s). The main air pressure must be between 15
psi and 25 psi. (If dual or switched-main air pressure is used, check the pressure at both
high and low settings.) The difference between “high” pressure main and “low” pressure
main should be at least 4 psi, unless otherwise noted, and the “low” set-ting difference
should exceed 15 psi.
4. Check that the unit damper will fail to the proper position when main air pressure is lost.
Disconnect the pneumatic actuator line from the velocity controller and observe the VAV
damper position. The damper should fail to either a normally open position (indicator mark
on shaft end is horizontal) or a normally closed position (indicator mark on shaft end is
vertical).
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
5. Check that there is primary airflow in the inlet duct.
6. Connect a Magnehelic gage, inclined manometer or other differential pressure measuring
device to the balancing taps provided in the velocity probe sensor lines. The manometer
should have a full scale reading of 0.0 to 1.0 in. wg. The high-pressure signal is delivered
from the front sensor tap (away from the valve), and the low pressure signal is delivered
from the back line (near the valve). The pressure differential between high and low
represents the amplified velocity pressure in the inlet duct.
7. Read the differential pressure and enter the Linear Aver-aging Probe Chart to determine
the airflow in the terminal unit. This chart is shown in Fig. 6 and is also attached to the side
of each unit. For example, a differential pressure of 0.10 in. wg for a size 8 unit yields an
airflow of 275 cfm.
Balancing Procedure (Control Sequences 1102 and 1103)
DIRECT ACTING THERMOSTAT; NORMALLY OPEN DAMPER (CONTROL SEQUENCE 1102)
— Refer to Fig. 7. (Beige Controller)
1. Minimum Volume Setting:
a. Disconnect the thermostat line from the volume controller.
b. Adjust the minimum volume control knob (marked “LO” and located in the center
of the controller) to achieve the required minimum flow. To determine the required
pressure differential, refer to Tables 2 and 5 and the Probe Chart provided on the
side of the VAV unit and in Fig. 6.
c. Reconnect the thermostat line.
2. Maximum Volume Setting:
a. Disconnect the thermostat line from the volume controller.
b. Apply 15 + psi to the thermostat port on the volume controller (marked “T”) by
tapping into the main air pressure line.
c. Adjust the maximum volume control knob (marked “HI” and located at the side of
the controller) until the desired pressure differential is registered on the
manometer. To determine the required pressure differential, refer to Table 5 and
the Probe Chart provided on the side of the VAV unit and in Fig. 6.
d. Reconnect the thermostat line.
REVERSE ACTING THERMOSTAT; NORMALLY CLOSED DAMPER (CONTROL SEQUENCE
1103) —Refer to Fig. 8 (Gray Controller)
1. Maximum Volume Setting:
a. Disconnect the thermostat line from the velocity controller.
b. Adjust the maximum volume control knob (marked “HI” and located in the center
of the controller)
c. To achieve the required minimum flow. To determine the required pressure
differential, refer to Tables 2 and 5 and the Probe Chart provided on the side of
the VAV unit and in Fig. 6.
d. Reconnect the thermostat line.
2. Minimum Volume Setting:
a. Disconnect the thermostat line from the velocity controller.
b. Apply 15 + psi to the thermostat port on the volume controller (marked “T”) by
tapping into the main air pressure line.
c. Adjust the minimum volume control knob (marked “LO” and located at the side of
the controller) until the desired pressure differential is registered on the
manometer. To determine the required pressure differential, refer to Table 5 and
the Probe Chart provided on the side of the VAV unit and in Fig. 6.
d. Reconnect the thermostat line.
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
Balancing Procedure (Control Sequences 1104-1110)
1. Damper action is factory set at N.O. (normally open), or N.C. (normally closed). To change
perform the following steps:
1. Loosen the damper selection screw.
2. Turn the selection dial clockwise until the “NC” or “NO” arrow aligns with the “DAMPER”
arrow.
NOTE: Accuracy in the alignment of the arrows is very important. Make this adjustment as exact
as possible. (See Fig. 10.)
2. Pipe the controller: Connect port “B” to the damper actuator. Connect port “M” to the
clean, dry main air. Connect port “T” to the thermostat output. Connect port “H” to the total
pressure tap o n the airflow sensor. Connect port “L” to the static pressure tap on the
airflow sensor. The controller can be set up for cooling or heating applications using either
a Direct Acting (DA) or Reverse Acting (RA) thermostat signal. The two flow adjustments
are labeled “LO STAT ∆P” and “HI STAT ∆P”.
Adjusting Minimums and Maximums
When adjusting the minimum and maximum airflow settings, the output responds slowly to
changes in the set point. Wait for the flow rate to stabilize after making an adjustment
(usually 20 to 30 seconds) before making further adjustments. Also, if the damper position
is all the way closed or open when starting this step, turn the adjustment one full turn, and
then wait 20 to 30 seconds for a change in the flow reading of the Magnehelic gauge. If no
change occurs after this time, repeat until the flow rate changes.
LO STAT ∆P setting is the desired airflow limit when the thermostat pressure is less than, or equal
to, the reset start point.
 For DA Cooling or RA Heating: Adjust LO STAT ∆P to the desired minimum airflow
with 0 psig (or a pressure less than the reset start point) at port “T”. The LO STAT ∆P
must be set first. The LO STAT ∆P will affect the HI STAT ∆P setting. (Turn
Clockwise)
 For RA Cooling or DA Heating: Adjust LO STAT ∆P to the desired maximum airflow
with 0 psig (or a pressure less than the reset start point) at port “T”. The LO STAT ∆P
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
must be set first. The LO STAT ∆P will affect the HI STAT ∆P setting. (Turn Counter
Clockwise)
HI STAT ∆P setting is the desired airflow limit when the thermostat pressure is greater than, or
equal to, the reset stop-point. The reset stop-point is the reset span pressure added to the reset
start point pressure.
 For DA Cooling or RA Heating (see Fig. 6): Adjust HI STAT ∆P to the desired maximum
airflow with 20 psig (or a pressure greater than the reset stop point) at port “T”. The HI
STAT ∆P must be set last. The HI STAT ∆P setting will be affected by the LO STAT ∆P
setting. (Turn Counter Clockwise)
 For RA Cooling or DA Heating (see Fig. 6): Adjust HI STAT ∆P to the desired minimum
airflow with 20 psig (or a pressure greater than the reset stop point) at port “T”. The HI
STAT ∆P must be set last. The HI STAT ∆P setting will be affected by the LO STAT ∆P
setting. (Turn Clockwise)
NOTE: IF the LO STAT ∆P Limit must be set at “0” (zero minimum), do not turn the LO STAT ∆P
knob fully clockwise. The knob will adjust one and one-half turns after a zero minimum is reached.
Turning the LO STAT ∆P knob fully clockwise will result in a negative reset condition. This means
that when the controller begins to reset at the reset start point, it must first overcome the negative
adjustment and will not begin to reset from “0” until a higher thermostat reset pressure is reached.
This negative reset will also reduce the effective range of the controller by reducing the low end
reset, narrowing the reset span. If a zero minimum is required, adjust the LO STAT ∆P knob until
the controller just begins to crack the damper open, and then back-off one-quarter turn and verify
zero airflow. (This is typically 2-1/2 knob rotations counter clockwise from the fully clockwise
position.)
NOTE: After the “LO STAT ∆P” and “HI STAT ∆P” initial adjustments are made, cycle the
thermostat pressure a few times to settle the internal reset mechanisms and verify settings. Finetune the settings if necessary. The thermostat pressure may be left at a high pressure and the “G”
port cap may be removed and replaced to cycle the reset mechanism.
RESET START setting is factory set at 8.0 psig. This is the lowest thermostat pressure that the LO
STAT ∆P airflow will begin to reset towards the HI STAT ∆P airflow. To change the RESET
START setting; regulate thermostat pressure to the “T” port to the desired reset start point
pressure, adjust RESET START adjustment until pressure at the “G” port is slightly higher than 0
psig, i.e., 0.1 psig.
Note: (For Dual Duct Units the Reset Start Must To Be Adjusted To 3.0 Psig. ON THE
HEATING SIDE ONLY)
NOTE: The “G” port taps into the controller’s internal reset chamber, which always starts at 0 psig.
The RESET START adjustment is a positive bias adjustment that sets the desired thermostat start
point to the controller’s internal reset start point of 0 psig.
RESET SPAN setting is factory set at 5.0 psig. This is the required change in thermostat pressure
that the controller will reset between the LO STAT ∆P setting and the HI STAT ∆P setting. To
change the RESET SPAN setting; adjust RESET SPAN adjustment until pressure at the “G” port
equals the desired reset span pressure. (Do Not Adjust)
NOTE: The “G” port taps into the controller’s internal reset chamber, which will always be at a
pressure between 0 psig and the RESET SPAN pressure.
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
Preventative Maintenance
1. Inspect pneumatic tubing for loose connections or leaks.
2. Clean out pneumatic line filters regularly according to manufacturer’s recommendations.
Pneumatic Control Troubleshooting
Table 6 – Pneumatic Controls Trouble Shooting
Analog Controls Installation and Balancing Procedures
The Analog Electronic Control System is a pressure independent volume reset control that uses a
KMC CSP-4702 controller-actuator (see Fig. 12).
Figure 12: CSP-4702 Controller/Actuator
Adjustments for the minimum and maximum airflow settings are made at the thermostat. The
thermostat (CTE-5202) operates on a 16 VDC power supply from the CSP 4702 controller and
outputs a 0 to 10 VDC signal on the AO1 and AO2 terminals. AO1 is used as the cooling output
and AO2 is used as the heating output.
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
Thermostat Installation
For proper operation, mount the thermostat on an interior wall. Do not mount the thermostat in a
location that will cause it to be affected by direct sunlight or other heat or cold sources. The
thermostat should be clear of all obstructions so it can properly sense the room temperature.
Complete rough-in wiring at each location prior to thermostat installation. Cable insulation must
meet local building codes.
1. Remove thermostat cover. If the thermostat is locked on the back plate, turn the two hex
screws in on the bottom of the cover (in the two outermost holes) in the back plate
CLOCKWISE until they clear the cover. Do not remove these screws completely. Swing the
thermostat up and away from the back plate to remove it.
2. Route the wires through the opening in the back plate.
3. Install the back plate directly to the junction box using the screws supplied with the thermostat.
Verify the hex screws used for securing the cover are located at the bottom before installing.
4. Connect the wires to the terminal block. Refer to the wiring diagram located on the inside
cover of the control enclosure of each unit showing the wiring terminations. The wiring
schematic can also be found on the control sequence submittal found on the Krueger website.
5. Replace the thermostat cover. Turn the two hex screws COUNTER CLOCKWISE until they
are flush with the bottom cover and secure it to the back plate.
Programming Thermostat
1. The thermostat has three sequences that are selectable from the display screen. To access
the configuration menu on the thermostat, press and hold the Up and Down arrows for 10
seconds until the display starts flashing “LIMITS”. Use the Up and Down arrows to scroll
between the different menu options or set a specific value. Use the Setpoint button to select a
menu or set a value.
2. To set the minimum and maximum airflow limits, Use AO1 Min and AO1 Max or AO2 Min and
AO2 Max. Use the Table 7 below to determine thermostat setting for the CFM per inlet size.
3. For details on how to program the thermostat for each control sequence see the specific
control sequence submittal. The control sequence submittals can be at the Krueger Website:
www.krueger-hvac.com.
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
AO1 & Sensor AO2 Signal 4 5 6 7 Setting "W.G. 0‐2 0.00 0 0 0 0 2.1 0.03 36 57 81 111
2.2 0.05 51 80 115 157
2.3 0.08 63 98 141 192
2.4 0.10 72 113 163 222
2.5 0.13 81 127 182 248
2.6 0.15 89 139 200 272
2.7 0.18 96 150 216 293
2.8 0.20 102 160 231 314
2.9 0.23 109 170 244 333
3 0.25 115 179 258 351
3.1 0.28 120 188 270 368
3.2 0.30 125 196 282 384
3.3 0.33 131 204 294 400
3.4 0.35 136 212 305 415
3.5 0.38 140 219 316 430
3.6 0.40 145 226 326 444
3.7 0.43 149 233 336 457
3.8 0.45 154 240 346 471
3.9 0.48 158 247 355 484
4 0.50 162 253 364 496
4.1 0.53 166 259 373 508
4.2 0.55 170 265 382 520
4.3 0.58 174 271 391 532
4.4 0.60 177 277 399 543
4.5 0.63 181 283 407 555
4.6 0.65 185 289 416 566
4.7 0.68 188 294 423 576
4.8 0.70 192 299 431 587
4.9 0.73 195 305 439 597
5 0.75 198 310 446 608
5.1 0.78 202 315 454 618
5.2 0.80 205 320 461 627
5.3 0.83 208 325 468 637
5.4 0.85 211 330 475 647
5.5 0.88 214 335 482 656
5.6 0.90 217 340 489 666
5.7 0.93 220 344 496 675
5.8 0.95 223 349 502 684
5.9 0.98 226 353 509 693
6 1.00 229 358 515 702
CFMs Per Inlet Size 8 9 10 12 14 16 20 22 0 145
205
251
290
324
355
383
410
435
458
481
502
522
542
561
580
597
615
632
648
664
680
695
710
724
739
753
767
780
794
807
820
832
845
857
869
881
893
905
916
0 183 259 318 367 410 449 485 519 550 580 608 635 661 686 710 733 756 778 799 820 840 860 879 898 917 935 953 970 987 1004 1021 1037 1053 1069 1085 1100 1115 1130 1145 1160 0 226 320 392 453 506 555 599 640 679 716 751 784 816 847 877 905 933 960 987 1012 1037 1062 1086 1109 1132 1154 1176 1198 1219 1240 1260 1281 1300 1320 1339 1358 1377 1395 1414 1432 0 326 461 565 652 729 798 862 922 978 1031 1081 1129 1175 1220 1263 1304 1344 1383 1421 1458 1494 1529 1563 1597 1630 1662 1694 1725 1755 1785 1815 1844 1873 1901 1929 1956 1983 2009 2036 2062 0 444 627 768 887 992 1087 1174 1255 1331 1403 1472 1537 1600 1660 1718 1775 1829 1882 1934 1984 2033 2081 2128 2174 2218 2262 2305 2348 2389 2430 2470 2510 2549 2587 2625 2662 2699 2735 2771 2806 0 580 820 1004 1159 1296 1420 1533 1639 1739 1833 1922 2008 2089 2168 2244 2318 2389 2459 2526 2592 2656 2718 2779 2839 2898 2955 3011 3067 3121 3174 3227 3278 3329 3379 3428 3477 3525 3572 3619 3665 0 315 445 545 630 704 771 833 891 945 996 1045 1091 1136 1178 1220 1260 1299 1336 1373 1408 1443 1477 1510 1543 1575 1606 1636 1666 1696 1725 1753 1782 1809 1836 1863 1890 1916 1941 1967 1992 0 1107 1565 1917 2214 2475 2711 2928 3130 3320 3500 3671 3834 3991 4141 4287 4427 4563 4696 4824 4950 5072 5191 5308 5422 5534 5644 5751 5857 5960 6062 6162 6261 6358 6454 6548 6641 6732 6823 6912 7000 Table 7: CFM Chart for setting min and max values on thermostat
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
Analog Control Troubleshooting — The following troubleshooting guide is directed towards
single duct cooling applications, the same concepts can be applied to other configurations.
NOTE: For about 15 seconds after power is applied, no rotation occurs and one or both of the
LEDs will flash.
Controller
1. Check that the shaft moves freely. (Press and hold the actuator release clutch and manually
rotate the shaft.)
2. Check wiring. (See Wiring Issues section below.)
3. Check for a tripped circuit breaker to the transformer, for proper supply voltage from the
transformer (or power supply), and for enough capacity (VA) for all connected devices.
4. Check that the direction jumper is in the proper position.
5. Check the polarity and level of the input signal from the thermostat.
Wrong Rotation Direction or Stroke Range
1. Check the position of the direction jumper.
2. Check the Min and Max flow limits on the thermostat
3. Check the adjustable stop position.
No Pressure Output Signal from Inlet Sensor
1. Check the wiring.
2. Check air flow and sensor. Tubing should be free of kinks and restrictions. Sensor must be
oriented in the correct airflow direction.
Wiring Issues
1. Check for correct wiring at unit and thermostat.
2. At the Controller, verify 24 VAC at terminals “~” (phase) and “-” (ground). Tolerance can
be –15% to +20% (20.4 to 28.8 VAC).
3. Verify 16 VDC at terminals “16 VDC” and “COM”
a. Tolerance is 15.0 to 17.0 VDC power supply to thermostat.
b. If not correct, disconnect thermostat and recheck.
c. If still incorrect, replace CSP controller.
4. Check “Requested Flow” voltage on terminal “2-10 IN” and “COM“.
a. Use Table 7 to correlate into cubic feet per minute (CFM)
b. If reading is not what is desired, see “calibration to adjust thermostat.
NOTE: Never jumper terminal 16 VDC to “-” as this would cause a short, and possibly
damage the power supply
NOTE: When using the same transformer for more than one control, the phase and ground
must be consistent with each device.
WATER VALVE INSTALLATION
WARNING: Disconnect power before wiring or electrical shock and personal injury could result.
Water valves are field supplied. Most control manufacturers offer three different hot water valve
applications; on/off and floating point, and proportional control. The controls contractor should
provide water valve specs used on controls supplied by others. To connect the field-supplied water
valves to the controller, refer to the wiring labels for the control package.
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
Replacement Parts Primary Damper Assembly
4, 5, 6" round (Includes damper blade and shaft)
7" round (Includes damper blade and shaft)
8" round (Includes damper blade and shaft)
9" round (Includes damper blade and shaft)
10" round (Includes damper blade and shaft)
12" round (Includes damper blade and shaft)
14" round (Includes damper blade and shaft)
16" round (Includes damper blade and shaft)
Size 20 - 13 1/2" x 7 7/8" rectangle (Includes damper blade and shaft)
Size 22 - 23 7/8" x 15 7/8" (Includes opposed blade damper and shaft)
Pneumatic Tubing, Tees and Caps
tee, 1/4", connects pneumatic tubing each
cap, 1/4", for pneumatic tubing each
tubing, 1/4", red, for pneumatic controls (1 foot length)
tubing, 1/4", green, for pneumatic controls (1 foot length)
tubing, 1/4", yellow, for pneumatic controls (1 foot length)
tubing, 1/4", Gray, for pneumatic controls (1 foot length)
inline filter for 1/4" pneumatic tubing
Four Quadrant, K4LineaCross Inlet Airflow Sensor
4” Inlet
5” Inlet
6” Inlet
7” Inlet
8” Inlet
9” Inlet
10” Inlet
12” Inlet
14” Inlet
16” Inlet
22" Inlet (Requires (2) Sensors per unit)
Part Number 30182001
30182002
30182003
30182004
30182005
30182006
30182007
30182008
3512701200
10336604
42150011
42160081
61510035
61510234
61510260
10221501
10154701
15010904
15010904
15010906
15010907
15010908
15010909
15010910
15010912
15010914
15010916
15010914
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
Transformers
120 volts to 24 volts, 50 VA
120 volts to 24 volts, 75 VA
277 volts to 24 volts, 50 VA
277 volts to 24 volts, 75 VA
208/240 volts to 24 volts, 50 VA
208/240 volts to 24 volts, 75 VA
480 volts to 24 volts, 50 VA
24 volts to 24 volts, 50 VA
10029301
10336801
10006601
10313401
10057501
10336901
10100301
10166601
Electric Heat and LineaHeat
Thermal cutout, automatic reset (115-130° Limit)
Thermal cutout, manual reset (160° Limit)
Disconnect Switch 30A Assembly (Does not include Snap-In Neutral Block)
Disconnect Switch 60A Assembly (Does not include Snap-In Neutral Block)
Disconnect Neutral Block - 30A (Snap-In)
Disconnect Neutral Block - 60A (Snap-In)
Magnetic Contactor, 30A, 24V coil, 1 pole (DIGITAL/ ANALOG)
Magnetic Contactor, 30A, 24V coil, 2 pole (DIGITAL/ ANALOG)
Magnetic Contactor, 60A, 24V coil, 2 pole (DIGITAL/ ANALOG)
Solid State Relay - 1 Pole, 50A (AC Volt)
EHM Board (including mounting bracket)
Solid State Relay - 1 Pole, 50A (DC Volt) [Crydom CWD 4850]
Heat Sink
Discharge Temperature Sensor
10052101
10118801
31453101
31453102
10341201
10341202
10323601
10054401
10162501
15018001
35134901
15012101
15012001
HH79NZ074
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
Water Coils
1 Row: Unit Size:
4-6
7-8
9-10
12
14
16
20
22
2 Row: Unit Size:
4-6
7-8
9-10
12
14
16
20
22
NOTE: 1 & 2 Row Coils can be used for both Left and Right
Hand Orientation
41410148
41410149
41410150
41410151
41410152
41410153
10344201
41410214
41410154
41410155
41410156
41410157
41410158
41410159
10344202
41410215
3 Row: Unit Size:
4-6
7-8
9-10
12
14
16
22
41410195 (RH)
15020301 (LH)
41410196 (RH)
15020302 (LH)
41410197 (RH)
15020303 (LH)
41410198 (RH)
15020304 (LH)
41410199 (RH)
15020305 (LH)
41410200 (RH)
15020306 (LH)
41410216 (RH)
15020307 (LH)
Models: LMHS, RVE, SVE
Form No. SIDOM.3 4/14
4 Row: Unit Size:
4-6
7-8
9-10
12
14
16
22
41410201 (RH)
15020401 (LH)
41410202 (RH)
15020402 (LH)
41410203 (RH)
15020403 (LH)
41410204 (RH)
15020404 (LH)
41410205 (RH)
15020405 (LH)
41410206 (RH)
15020406 (LH)
41410217 (RH)
15020407 (LH)